1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86537adeba2ad0142e04ab42788dd9e8a77a521f6fc244088beead8918fed6d3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f20860c8-012a-47b6-93fc-a19307462959.json and https://artists.proofprofile.net/proofs/artist/f20860c8-012a-47b6-93fc-a19307462959.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b6bf66464f96da23231e7e9cc2761a6e7f40f50730f6a2f57955517b7af4fb. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ62384489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce0f05b70e9a93101426adf813da4e6333b9224b4f2d65c2f81d749fdcd6e37. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNB2354801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1428692394dd61ceb713dc7fc9397363dd284bb177dd34e67ee4dda3f5e307f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFE2315926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62563fd01e71ce0e3152ec5b382a09325fe4fbb26215accdc01331730ce5d09. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N1925303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df52571e152de033c5e53121fbf797d6b39cab970ae96a86c8afb6f491b3470. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3Q92173510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4df0e38076dd1cf9a362b44b0cf71386b97020d93dc00d415cbae71fb4c07f4. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2148003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcfc21b699ed7a10978620cdeca0304e2a3d7620ae295415ac390b5b533b1a9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2323842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce0f05b70e9a93101426adf813da4e6333b9224b4f2d65c2f81d749fdcd6e37. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNB2354801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77f7ad8f291e614b9e9d915f916cc5813b7879b8e364518029e66d4abf38821. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ792414619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94edf6c85ef601c1178c1e887b0902467c18a58b2da759f6ae1247e2268e9bf. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBRKQ2560502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1d2619d563c97061fa0e4f192fa976fc8ce39851857b45cf45d309d8e0cebc. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTRX2547471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81738a671b557832ac6f392c39bd16c8ea4e8aea764c0c58adbc4e511c6bedb0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDD2545421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1d2619d563c97061fa0e4f192fa976fc8ce39851857b45cf45d309d8e0cebc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTRX2547471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94edf6c85ef601c1178c1e887b0902467c18a58b2da759f6ae1247e2268e9bf. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:05:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBRKQ2560502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77f7ad8f291e614b9e9d915f916cc5813b7879b8e364518029e66d4abf38821. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ792414619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90310afd828e28fd1c6959c160ce1e77e7ba4097a8ee96d4a1db464554665b29. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:50:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFN2439771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99f5fe38ae7c521e8ed41a6d144247118bb270f59e2b1054ea78c1634ec7626. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZEC2460400.